Torsion-balance scale.



s. M. CONWAY.'

TORSION BALANCE SCALE.

APPLICATION FILED JUNE 9,1915- Patented Feb.1,v1916 THE COLUMBIAPLANOGRAPH C0., WASHINGTON. D. c.

E UNITED Arredamomc.

GEORGE M. CONWv AY, OEJERsEY Crrv, NEW JERSEY, AssreNoE, To THE'roEsroN' BALANCE COMPANY, CE NEW YORK, N. Y., a CORPORATION OE NEWYORK.

Application filed I une 9,` 1915.

y To all whom t may concern.' y

Be 1t vknown that I, GEORGE M. CONWAY,

a citizen of the United States, residing at Jersey City, in the countyof Hudson and State of New Jersey, have invented certain new and usefulImprovements in Torsion- Balance Scales, of which the following is aspecification. i I

This invention relatesfto scales or balances of the torsionA type. Theconnections between the various parts of the balanceare afforded bymeans of stretched wire or ribbon which twists slightly `with therocking movements ofthe beam. f

The wire or ribbon (hereinafter referred to by the term wire7 or tensionwire) is usually tightly stretched around a truss frame of metal, theends ofthe wire being joined together in such manner that the wire issubstantially continuous. These truss frames, preferably, three, areconnect ed to the scale beam, which generally is comprised of a pairofparallel beams, by` clamping the wire to the beams, the trusses beingnormally disposed in parallel relation in vertical planes. One of thetrusses, usually the centermost, is held stationary and affords thefulcrum or center support of the balance, the end trusses serving tosupport the scale pans. Y n l The object of the -presentl invention isto provide means for adjusting the clamps in such manner that both' endtrusses may be equidistant from the fulcrum truss, that parallelrelation of the parts be assured, and

interchangeable construction made feasible.l

`In the drawings accompanying this specilication, one practicableembodiment ofthe invention is illustrated.

In such drawings,-`Figure-1is a longitudinal section of a balance scaleequipped with the present improvement. rIhe plane of this section isrepresented by' the line 1 1 in Fig. 2. Fig. 2 isvan endelevation vofthe mechanism and a cross section Of the housing, taken On a plane atabout the line Q-Q of Fig. 1'; Fig. 3 is an enlarged longitudinalsection througlrone of Vthe beam ends and Vthe wire clamping device;and' Fig. l is a longitudinal section through the center of one of thebeams showing the fulcrumwire clamping device. t

In the illustration, the base 1s represented by the reference character5, which is'of some suitable construction, The working Specification ofLetters Patent.

Patented Feb. 1,1916; serial No. 33,048.

parts are shown housed by means of a top plate 6 resting upon a sheetmetal side wall 7 which is supported by the base.v The fulcrum truss Sis shown carried by standards 9 rising from the base. A pair ofbeams isillustrated, designated by the reference characters 10-10. These beamsare shown in parallel relation and disposed one above the other and eachhaving its fulcrum at about its longitudinal center.` 'Ihe upper andlower fulcruinwires 11-11-of the fulcrumtruss 8 are show-n clamped tosuitable tension wire seatsprovided on the upper f and lower beamsrespectively. In the pres-v ent illustration each beamis above thefulcrum wire to Awhich it is clamped. An en-v larged detail of thefulcrum wire clamp is illustrated in Fig. 4. The lower side of the beamat its center portion is shown recessed at `12 for receiving one of theclamp members 18, between which clamp: member and the clamp member 14the wire is held in position.l Screws 15, l5, are shownmov-- able freelythrough the beam and the clamp member 13, and having screw-threadedcon-Y nection with the clamp member 14:.,v .These screws are showndisposed on each side vof the wire seat, which seat in the present in-Astance is vat the bottom ofa recess. 16 toward which the wire is pressedby arib 17 carried by the clamp-` member .14. A set screw l18 is shownpreferably. located medially of the Vbeam and having screwthreadedconnection therewith. The screw 18 coposes'of adjustment, which willbehereinafter explained. Y i' The ends `of the beams-aty each YsideV areshown `connected by trussesV 19,'l each of'I which is provided withkupper and lower wires 20 to which the ends of the beams are clamped. Adetail of the clamp isillustrated in Fig. 3. The clamp is shown ascomprising a slide 21V preferably formed of sheet metal andhaving aportion disposed on the upper side and a portion. disposed on the lowerside of the'end of the beam. I-Ioles are formed through the member 2land the end of the beam for accommodating'the body portion of theset-screws 22. Such holes are so formed that ,considerable-clearance. isafforded. The wirev 2O is shown clamped against the under side of theslide 21 by means of a clamp plate 23 having screwthreaded connectionwith the ends of the `Setsscrews 2:2.

For the satisfactory working of a balance of this character it isnecessary that the trusses be placed at the proper distances one fromthe other, the beams be maintained in parallelism, the trusses bemaintained in paralle'lrelation, and the wires be free from strainsother than those incident to the balancing of the device. If, in settingup the device,it is found that one of the end trusses is out ofposition, or in its usual mode of operation is not in a vertical plane,the clamp as a 4whole on the end of the beam will be moved inwardly oroutwardly of the beam untill afproper position is effected. At timesit'uisidesiif'able to move one or both of the wirerseats carriedbytheclamps at the end offthe'b'eani toward or from the center or fulcrum ofthe beam. vThis movement can be@accomplished without unclamping thewirei20.` `Such inward and outward movement of the clamp is effected bymeans of an" adjusting screw 26 engaging a screwthreaded socket` in theend of the beam and having `a neck portion @+L inwhich the edges 25'ofthe ends of the slide 2l are located. Adjustment in someinstances iseffected by one'clamp and in `others by the use of sere al ofthe-clamps. "By reference to Fig. 2 it will een thatthe end ofthe slideis notched sothat in assemblingthe clamp, the screw 26 is placed in itssocket and the slide 21. appliedby a lateral movement. 1When in place,lthe clamp screws 22 prevent its disengagement from the adjusting screw2G. If thesetlfscrews 2Q arel set ldown so tightly that itisimpossibleor diflicult to effect the adjustment by l,means of the adjusting screw26,f ofcourse they can be backed voft to such extent tliat'theVadjustment may readily be effected withoutv'unclainping or releasing thewire.

i It is desirable that the wires at each end and the center of` eachbeam, (in `the present illustrationsthe wires QO-QO and 1l) shall, whenthe trusses are of uniform height, be on the same plane, or that theirclamping l seatsshallbeoii-the sa'mevplane. It is very diiiic'ultinmaking interchangeable parts, to produce-the Yclamping seats for thewires in exactlyt'he saine plane. The adjustment of the clan1p`in thevmanner shown in Fig. 4 is foretl'ecti'ng the"v adjustment and alinementoftheclamp faces.` It will be seen that by releasing or advancing thescrew 18 the clamping face for the wire 11 may be raised or lowered.`-Acljusting means is thereby provided for adjusting the fulcrum orintermediate tension wire seat in a direction perpendicular to the beamand the plane of the endV seats. IIn some instances it may befoundnecessary to tilt the wire or clamp seat, in which case one or theother of the Screws 15 may be set down harder than the other, as will beapparent, to rock the clamp seat into the desired position.

It will be apparent that as each end of each beam is provided with meansfor adj usting the clamp or wire seat longitudinally of the beam, thatthe adjustment of the end trusses into their proper parallel vertical.positions may be readily iccomplished, ir respective of the faults whichmay occur in the parts, particularly the beams, when manufactured by the`interchangeable system or when manufactured at different times.

llthough one embodiment of the invention is illustrated, vet it will beapparent that changes may be made within the scope of the claims withoutdeparting from tie spirit of the invention.

I claim as my invention :-u

l. ln a balance, a pair of parallel beams, a pair of trusses eachhaving' on each of two opposite sides a tension wire, tension wireclamps carried by the ends of the beams, and means for adjusting one ofthe said clamps longitudinally of the bram carrying the same foradjusting the trusses into parallel relation.

In a balance, a pair of parallel. beams, a pair of trusses each haringon each of two opposite sides a tension wire, tension wire clzfunpscarried by the ends of the beams, andl means for severally adj ustiugthe clamps longitudinally of the. beams for adjusting the trusses intoparallel relation.

f3. In a balance, a pair ol parallel beams, a fulcrum truss having oneach of two opposite sides a tension wire` the beams being mediallyconnected to said wires respectively, a pair of end trusses each` havingon each of two opposite sides a tension wire, tension wire clampscarried by the ends of the beams, and means .for adjusting one of thesaid clamps longitudinally of the beam carrying the same for adjustingthe position of the end truss relatively to the fulcrum truss.

4l. In a balance, a pair of parallel beams, a fixed fulcrum truss`having on each of two opposite sides a tension wire, the beams be ingmedially connected to said wires respectively, a pair of end trusseseach having on each of two opposite sides a tension wire, tension wireclamps carried by the ends of the beams, and means for severallyadjusting the clamps longitudinally of the beams for adjusting theposition of the end trusses relatively to the fulci'um truss.

l'ln a`balance, a` pair of parallel beams, a liXed fulcrum truss lhavingon each of two opposite sides a tension wire, the beams being` mediallyconnected to said wires respectively, a pair of end trusses each havingon each of two opposite sides a tension wire, tension wire clampscarried by the ends of the beams, means for severally adjusting the sa Vclamps longitudinally of the beams for adjusting the position of the endtrusses relatively to the fulcrum truss, a tension Wire clamp carried byeach beam for engaging the fulcrum truss Wires, and means for mov ingthe said clamps vertically in the general plane of such beams.

6. In a balance, the combination of three trusses each carrying atension Wire, a beam, tension Wire clamps carried by the ends of .thebeam, a tension Wire clamp carried by the center of the beam, and meansfor vertically adjusting the latter clamp.

7. In a balance, the combination with three trusses each carrying atension Wire, a beam, tension Wire clamps carried by the ends of thebeam, means for adjusting one of said clamps longitudinally of the beam,a tension Wire clamp kcarried by the `center of the beam, and means forvertically adjusting said clamp.

8. A beam for a torsion balance, said beam having a tension Wire seat ateach end, an intermediate tension Wire seat carried by the beam, meansfor clamping tension Wires to the said seats, and means for adjustmg thesaid intermediate tension Wlre seat 1n a direction perpendicular to theplane of the end seats.

9. A beam for a torsion balance, said beam having a tension wire seat ateach end, an intermediate tension Wire seat carried by the beam, meansfor clamping tension Wires to the said seats, means for 'adjusting thesaid intermediate tension Wire seat in a direction GEORGE M. CONWAY.

Witnesses:

THOMAS F. WALLACE, FRED WHITE.

(Luniesr of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

